#define _CRT_SECURE_NO_WARNINGS

#include "date.h"

Date&Date:: operator +=(int day)
{
	_day += day;
	while (_day > getmonthday(_year, _month))
	{
		_day -= getmonthday(_year, _month);
		_month++;
		if (_month == 13)
		{
			_year++;
			_month = 1;
		}
	}
	return *this;
}

Date Date::operator +(int day)
{
	Date tmp(*this);
	tmp += day;
	return tmp;
}


void Date::print()
{
	cout << _year << " " << _month << " " << _day;
	cout << endl;
}

Date& Date::operator -=(int day)
{
	if (day < 0)
	{
		return *this += -day;
	}
	_day -= day;
	while (_day <= 0)
	{
		--_month;
		if (_month == 0)
		{
			 _year--;
			_month = 12;
		}
		_day += getmonthday(_year, _month);
	}
	return *this;
}

Date Date::operator -(int day)
{
	Date tmp(*this);
	tmp -= day;
	return tmp;
}

//++d1
Date& Date::operator++()
{
	*this += 1;
	return *this;
}
//d1++
Date& Date::operator++(int)
{
	Date tmp(*this);
	*this += 1;
	return tmp;
}
//--d2
Date& Date::operator--()
{
	*this -= 1;
	return *this;
}
//d2--
Date& Date::operator--(int)
{
	Date tmp(*this);
	*this -= 1;
	return tmp;
}
//d1<d2
bool Date::operator <(const Date& d)const
{
	if (_year < d._year)
	{
		return true;
	}
	else if (_year == d._year && _month < d._month)
	{
		return true;
	}
	else if (_year == d._year && _month == d._month && _day < d._day)
	{
		return true;
	}
	else
		return false;
}
//d1==d2
bool Date::operator ==(const Date& d)const
{
	return (_year == d._year && _month == d._month && _day == d._day);
}
//d1<=d2
bool Date::operator<=(const Date& d)const
{
	return *this < d || *this == d;
}

//d1>d2
bool Date:: operator >(const Date& d)const
{
	return !(*this <= d);
}

//d1>=d2
bool Date::operator >=(const Date& d)const
{
	return !(*this < d);
}
//d1!=d2
bool Date::operator!=(const Date& d)const
{
	return !(*this == d);
}

//d1-d2
int Date::operator-(const Date& d)const
{
	int flag = 1;
	Date max = *this;
	Date min = d;
	if (*this < d)
	{
		max = d;
		min = *this;
		flag = -1;
	}

	int n = 0;
	while (min != max)
	{
		++min;
		++n;
	}
	return n * flag;
}